提高白砂糖质量的新途径

白砂糖的质量指标很多,除蔗糖分外,其中主要的指标有水分、色值、灰分、水不溶物等。要达到高质量的指标,世界上大部分的甘蔗糖厂都采用精炼糖的方法。虽然碳酸法可得到质量较好的白砂糖,但由于我国甘蔗碳酸法     

甘蔗碳法糖厂过滤技术方案探讨

本文以近几年甜菜糖厂新型过滤技术成功应用为背景,针对甘蔗原料特点分析了甘蔗糖厂在应用碳酸法澄清进行工艺改进的技术要点,重点论述甘蔗碳法糖厂应用新型增稠过滤技术方法,提出大型甘蔗糖厂澄清技术方案。     

用碳酸法甘蔗糖厂污染物制复合肥料的研究

一、前言碳酸法甘蔗糖厂在生产过程中要排出对蔗比约9%的湿滤泥;我国采用碳酸法工艺的甘蔗糖厂有14间,每年共榨甘蔗约370万吨,产湿滤泥约33.3万吨;除个别厂利用部分滤泥烧制水泥外,其余绝大部分均排入各自接受的水域。     

碳酸法甘蔗糖厂“蔗饭”防抑措施探讨

讨论了碳酸法甘蔗糖厂饱充罐、喷射饱充器两种类型二碳饱充设备产生“蔗饭”的前期征兆、检测方法、处理办法及防抑措施。强调早发现早处理 ,尽可能减少微生物的蔗糖损失     

炼糖工艺的革新

目前我国糖厂精炼原糖都是利用糖厂的原有设备,碳酸法厂采用碳酸法,亚硫酸法厂则采用亚硫酸法炼糖。不管采用那一种精炼方法,都要采用压力式过滤机,如叶滤机或压滤机,甘蔗糖厂则多数采用压滤机。为了节约燃     

湖南省利用甜菜制糖

湖南省第一间机制甜菜糖厂建于湖南省北部石门县东山峰,日处理100吨甜菜,采用碳酸法生产耕地白糖,于1974年投产。为了广开糖源,延长榨期,充分利用原有甘蔗糖厂的设备能力,汩罗江、钱粮湖、西洞庭和大通湖等四间中型甘蔗糖厂,75/76年榨季委托湖南省轻     

甘蔗品种砍收后蔗糖分转化及蔗糖转化率的建立

甘蔗生产上忽视了与糖厂产糖率密切相关的性状即甘蔗品种砍收后蔗糖分转化程度,造成糖厂大面积种植砍收后蔗糖分极易转化的品种如川糖１１号本文分析了由此产生的严重经济损失,并建立了甘蔗品种蔗糖转化率衡量吹收后蔗糖分转化程度,作为糖厂推广种植良种和选育的筛选性状之一。     

甘蔗农业文摘

四川蔗区近年部份大、中型糖厂甘蔗蔗糖分下降的情况调查——李华富,四川甘蔗,1991(3),25—31 甘蔗原料质量与制糖工业关系密切,在糖厂榨季生产中每提高1%甘蔗蔗糖分(绝对值),则增加纯糖经济效益200元。我省蔗区多年来甘蔗糖分波动很大,“七·五”期内部份大、中糖厂还趋于下降。甘蔗蔗糖分下降成为制糖企业亏损的重要因素之一,     

强碱气浮法提净蔗汁中试阶段总结和评议

轻工业部甘蔗糖业研究所和广东省中山糖厂协作,在该厂进行强碱气浮法提净蔗汁中间试验,每天处理100吨甘蔗,经1982～83和1983～84年两个榨季试验,效果基本符合攻关指标;并于1984年2月29至3月1日在中山糖厂进行阶段总结和评议.认为该法吸取了碳酸法的特点,但耗用石灰量仅为碳酸法的25%左右,而效果接近碳酸法,是一种有生命力的工艺     

碳酸法糖厂糖浆上浮系统技术改造

介绍甘蔗碳酸法糖厂糖浆上浮系统的技术改造以及运行实践。运行表明,采用该项技术后,达到了除掉糖浆中绝大部分悬浮物、灰份和胶体物质,减少煮糖罐积垢,降低成品糖灰份、浊度,降低白糖残硫量,提高成品糖质量的目标,提高了伶俐糖厂白砂糖在市场上的竞争力和影响力。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press